Update CHANGELOG_UNRELEASED.md

Co-authored-by: Alessandro Bruni <alessandro.bruni@gmail.com>

Author: affeldt-aist

CHANGELOG_UNRELEASED.md

@@ -244,7 +244,7 @@
 
 - in `lebesgue_integrable.v`:
   + `integral_fune_lt_pinfty` -> `integrable_lty`
-  + integral_fune_fin_num` -> `integrable_fin_num`
+  + `integral_fune_fin_num` -> `integrable_fin_num`
 
 ### Generalized